Quiz 3 Flashcards by Proxy Email

Apparent changes in the pH solution when it is continuously used for 30 days without storage at 4 deg C.

A. microbial growth

B. unstable pH

C. high in nitrogenous substance

D. all of the above

A. microbial growth

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In redox titration, what chemical substance is added to the iodometry and iodometry analysis?

A. starch

B. phenolphthalein

C. glucose

D. argentum

A. starch

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The extent of radiation absorbed by the absorbing species is a function of the path length and the constant concentration of the absorbing species.

A. Beer-Lambert’s Law

B. Beer’s Law

C. Lambert’s Law

D. none of the above

A. Beer-Lambert’s Law

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Name the chloride of metal which dissolves in excess of ammonium hydroxide?

A. lead (II) chloride

B. copper (II) chloride

C. silver chloride

D. sodium chloride

C. silver chloride

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Which of the following acids can be used to acidify silver nitrate solution for the test of halides?

A. hydrochloric acid

B. dilute nitric acid

C. sulphuric acid

D. carbonic acid

B. dilute nitric acid

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After shaking the separating funnel, we should invert it and open the tap. Which of the following statements is the purpose for the above procedure?

A. to extract the desired substances more efficiently

B. to mix the two solvent layers by air

C. to get rid of the impurities

D. to release the pressure

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Factors to be considered during preparation of the sample solution in gravimetric analysis?

A. pH

B. temperature

C. volume of solution

D. all of the above

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Which of the following is known as calomel?

A. silver chloride

B. mercury chloride

C. potassium chloride

D. mercury sulphate

B. mercury chloride

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The chemical specie that is being measured is

A. analyte

B. a matrix

C. a compound

D. a component

A. analyte

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The liquid, solid or mixed material in which the analyte must be determined is

A. analyte

B. a matrix

C. a compound

D. a component

B. a matrix

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Which describes gravimetric analysis?

A. precipitate and weigh products

B. very precise

C. very limited

D. all of the above

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If repeated measurements of the same thing are all very close to one another, then the measurement is

A. precise

B. accurate

C. estimated

D. all of the above

A. precise

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Random error is a measure of

A. precision

B. accuracy

C. true value

D. all of the above

A. precision

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Difference between the mean of a population of measurements and the true value.

A. systematic errors

B. random error

C. gross error

D. all of the above

A. systematic errors

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An analysis of the wavelength dependence on the absorbance or emission of light is called

A. spectroscopy

B. potentiometry

C. gravimetry

D. electrochemical analysis

A. spectroscopy

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Organic solvent that may be used to remove grease films.

formaline

benzene

toluene

chloroform

benzene

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Interaction of solute molecules (or atoms or ions) with the surface of the stationary phase in chromatography is

A. adsorption

B. absorption

C. desorption

D. all of the above

A. adsorption

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Which of the following is a chemical drying agent or desiccants?

A. anhydrous calcium chloride or calcium sulfate

B. magnesium perchlorate

C. phosphorous pentoxide

D. all of the above

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Which of the following affects pipetting accuracy?

A. temperature and pressure

B. volume and pH

C. humidity and volume of sample

D. none of the above

A. temperature and pressure

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Most accurate pipets with well defined tolerance limits is

A. automatic pipets

B. class A

C. class B

D. serological pipets

B. class A

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The column of water extending in tubes from plant roots to leaves is due mostly to

A. cohesion

B. evaporation

C. hydrophobic interactions

D. ionization

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A. cohesion

There are millions of organic compounds but only thousands of inorganic compounds because

A. organic compounds were formed by living things

B. there is more carbon on the Earth’s surface than any other element

C. atoms of elements other than carbon never combine with themselves

D. carbon atoms can combine with up to four other atoms including other carbon atoms

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D. carbon atoms can combine with up to four other atoms including other carbon atoms

The noble gases are

A. diatomic

B. monoatomic

C. triatomic

D. monoclinic

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B. monoatomic

Which of the following is a metal?

A. Zn

B. F

C. S

D. I

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A. Zn

25. Which one of the following is a metalloid? A. O B. S C. Se D. Te

D. Te

26. Of the following, which has the smallest electron affinity? A. H B. Br C. Cl D. F

A. H

27. Which of the following is the largest atom? A. Al B. Mg C. Ca D. Rb

D. Rb

28. Of the following choices, which element is the most metallic? A. calcium B. strontium C. magnesium D. barium

D. barium

29. Which of the following is an inner f-block metal? A. Zn B. Sc C. Ga D. U

D. U

30. The alkali metals belong to A. group IV-A B. group III-A C. group IIA D. group IA

D. group IA

31. Of the following gases, the one with the greatest density at STP is: A. CH4 B. NH3 C. Ne D. H2

C. Ne

32. The phenomenon in which a steel needle can, with proper care, be made to float on the surface of some water illustrates a property of liquid known as: A. compressibility B. polarizability C. surface tension D. triple point

C. surface tension

33. The property of liquid that measures its resistance to flow is called: A. capillarity B. polarizability C. resistivity D. viscosity

D. viscosity

34. The temperature ate which the vapor pressure of a liquid equals the external pressure is called the : A. boiling point B. critical point C. melting point D. sublimation point

A. boiling point

35. Liquid and vapor phases of a substance become indistinguishable at the: A. triple point B. normal point C. permanent point D. critical point

D. critical point

36. Which of the following is the reason that metals conduct electricity? A. The metal atoms are close together B. There are no empty spaces in metal structures C. Electrons in the structure can move freely D. Electrons and protons in the structure can move freely

C. Electrons in the structure can move freely

37. Which of the following is the reason why salt stay bonded in the solid state? A. There are strong covalent bonds between the ions B. The structure consists of salt molecules tat bind tightly to other salt molecules C. They are held together by electrostatic attractions and the structure includes no electrostatic repulsions D. There are both electrostatic attractions and repulsions within the structure but the total of the attractions is greater

D. There are both electrostatic attractions and repulsions within the structure but the total of the attractions is greater

38. What term is used to define the phenomenon of emission of light in a chemical reaction? A. Chemical luminescence B. Photosensitization C. Both chemical luminescence and photosensitization D. None of the above

A. Chemical luminescence

39. Which of the following instruments makes use of the standard electrode potentials and the variation of electrode potential with concentration? A. Polarimeter B. pH meter C. Electrophorous D. Electrophotometer

B. pH meter

40. The series in which the electrode potentials of metals are arranged in an order is known as: A. electrical conductivity series B. electrode potential series C. electrochemical series D. chemical affinity series

C. electrochemical series

41. ______ is the Greek word for salt forming. A. actinides B. halogen C. lanthanide D. transition

B. halogen

42. Group VIIA elements are A. inert at room temperature B. known as the halogens C. the largest atoms on the periodic table D. low in electronegativity

B. known as the halogens

43. As the atomic number increases in a group, the chemical properties A. change B. stay roughly the same C. decrease D. stabilize

B. stay roughly the same

44. Those elements in which electrons from the two outermost sublevels may be involved in a chemical reaction are known as A. group VIIA B. the metalloids C. the nonmetals D. the transition elements

D. the transition elements

45. Group I elements, is also known as A. alkaline earth metals B. halogens C. alkali metals D. chalcogen

C. alkali metals

46. Elements in the same vertical group of the periodic table have generally the same A. atomic number B. electronic configuration C. number of isotopes D. valence electrons

D. valence electrons

47. The modern periodic table is based on A. atomic radius B. atomic mass C. atomic number D. atomic charge

C. atomic number

48. The properties of the atoms depend on their A. mass B. number C. radius D. structure

D. structure

49. The periods on the periodic table are represented by A. columns B. rows C. metallic elements D. inert gas members

B. rows

50. Columns on the periodic table are called A. gases B. solids C. periods D. groups

D. groups

Quiz 3 Flashcards

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